I just ran across this post from Eyonix on the WoW Hunter forum:
I wanted to share with you some changes affecting hunters that are coming in a small patch. The effect of aspect of the viper is being increased. Pet leveling speed will be substantially increased. Lastly, it will once again be possible for two freezing traps to be in place at the same time.
Let me repeat the really important part of this: Pet leveling speed will be substantially increased.
To which I can only say: YES! And I’m interested in the phrase “coming in a small patch” — that would seem to imply a fairly quick turn-around, that we won’t have to wait for Patch 2.4 for this.
[Edit: This change is in patch 2.3.2 which is going on the PTR tonight. I'll have more info about the numbers up in a separate post as soon as I learn something.]